Hi everyone. I've just purchased an Analog Discovery 2 after searching for USB based measurement devices for use in a Vintage Rapair scenario. In my case, I fell in love with electroncs at an early stage, went on to study it in High School, College and University, and then worked in the field briefly as VCR repair shops became inviable and I moved to IT wth no complaints. Now able to return to electronics many years later simply because I love it, I find that the classic test equipment still looks cool, but is arguably obsolete or facing it in the near future. The AD2 provides outstanding value compared its peers and provides a massive reduction in upfront cost, space, and energy consumption which might be near 100:1 in each case. Release of the "Audio Analyzer Suite" software by a third party made the decision by the AD2 an easy one as it offers THD measurements suitable to many such as myself. I'm appreciative to the many YouTube content creators who discovered this years ago and I've been watching them in amazement and wondering why so few have discovered this product since it came out. Take Care all.